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115mph only,help please
Posted: Tue Jan 31, 2006 10:17 pm
by zxaaahhhhh
hi,im new so hello to every1 problem i got is i have a j plate uk model zxr400l which will only do 115mph flat out,i got a dyno sheet of the person i bought here from stating 62.6horses she should be going more than 115mph read about people having 140mph out of thiers?any got any ideas ive seen those rev boosters and stuff on ebay but i think they for imports,any help greatley appreciated
Posted: Tue Jan 31, 2006 11:08 pm
by Gemini
has anyone messed about with its gearing?
i think the bigger u go with the back sprocket, u get increased acceleration but lower top speed.
did the previous owner have a restricted license? just trying to establish it was restricted after its dyno test?
may have washers in the carbs u c
gem
Posted: Wed Feb 01, 2006 5:24 pm
by zxaaahhhhh
not sure about the gearing have to check,it doesent seem to rev itself out in the top to gears which made me think it restricted some how, but been told since that because its a uk bike it not restricted in anyway?
Posted: Wed Feb 01, 2006 8:49 pm
by RedexRobB
The standard sproket sizes are 15 teeth on the front and 45 teeth on the rear.
It may well be restricted in terms of 33bhp becuase 115mph sounds about right for a restricted ZXR, only way to know it to take the carbs off and check.
Posted: Wed Feb 01, 2006 9:39 pm
by Guest
ok cheers thanks for info on sprocks
Posted: Thu Feb 02, 2006 7:16 pm
by mongo
RobB wrote:The standard sproket sizes are 15 teeth on the front and 45 teeth on the rear.
It may well be restricted in terms of 33bhp becuase 115mph sounds about right for a restricted ZXR, only way to know it to take the carbs off and check.
You dont have to take the carbs off to check if the plates are there. Take the tank and airbox off, then look under the inlet rubbers to see if theres a metal plate between the rubbers and the cylinder head.
The other way is to open the throttle wide open and look down the carbs, you should be able to see if theres a round plate with a round circle in the middle.
Posted: Thu Feb 02, 2006 8:54 pm
by RedexRobB
mongo wrote:
You dont have to take the carbs off to check if the plates are there. Take the tank and airbox off, then look under the inlet rubbers to see if theres a metal plate between the rubbers and the cylinder head.
The other way is to open the throttle wide open and look down the carbs, you should be able to see if theres a round plate with a round circle in the middle.
Now theres a man with his head screwed on! Very good point! And welcome to the forum
Posted: Fri Feb 03, 2006 5:01 pm
by Guest
thanks for all the help
Posted: Tue Mar 14, 2006 2:04 pm
by diesel
take your foot off the brake
Posted: Sun Mar 19, 2006 10:50 pm
by richie400ss
is it an import?
if it is, they are restricted to 'something' kph, which is somewhere between 115 and 120. disconnect the speedo cable and ask a mate to verify your top speed.
if that's it, you can buy a frig device for under £20 or do what i did and just remove the speedo cable.